So, I've been stuck on this one question for about an hour, and I need some help

Find the value of e.

http://i.imgur.com/lFRXYvo.png

I could use some guidance on this

Question

So, I've been stuck on this one question for about an hour, and I need some help

Find the value of e.

http://i.imgur.com/lFRXYvo.png

I could use some guidance on this

loser66 · Answer

https://www.google.com/search?q=law+of+cosines&biw=1920&bih=922&tbm=isch&tbo=u&source=univ&sa=X&ei=PUjMVJvgLImhNqj5gfAI&sqi=2&ved=0CDgQsAQ#imgdii=_&imgrc=dSC___BQqzyQsM%253A%3BhCCTIxJT5lLiAM%3Bhttp%253A%252F%252Fwww.mathwarehouse.com%252Ftrigonometry%252Fimages%252Flaw-of-cosines%252Flaw-of-cosines-formula-and-picture2.png%3Bhttp%253A%252F%252Fwww.mathwarehouse.com%252Ftrigonometry%252Flaw-of-cosines-formula-examples.php%3B533%3B221

radar · Answer

The Law of Sines is your friend|dw:1422674962877:dw|